[llvm] [LLVM][Support] add nonNull function helper (PR #188718)

[Jakub Kuderski via llvm-commits]

Nathan =?utf-8?q?Gauër?= <brioche at google.com>,
Nathan =?utf-8?q?Gauër?= <brioche at google.com>,
Nathan =?utf-8?q?Gauër?= <brioche at google.com>,
Nathan =?utf-8?q?Gauër?= <brioche at google.com>,
Nathan =?utf-8?q?Gauër?= <brioche at google.com>,
Nathan =?utf-8?q?Gauër?= <brioche at google.com>,
Nathan =?utf-8?q?Gauër?= <github at keenuts.net>,
Nathan =?utf-8?q?Gauër?= <brioche at google.com>
Message-ID:
In-Reply-To: <llvm.org/llvm/llvm-project/pull/188718 at github.com>


================
@@ -811,6 +811,25 @@ T cantFail(Expected<T> ValOrErr, const char *Msg = nullptr) {
   }
 }
 
+template <typename T>
+using compare_nullptr_t = decltype(std::declval<T &>() == nullptr);
+
+template <typename T>
+using is_nullptr_comparable = llvm::is_detected<compare_nullptr_t, T>;
----------------
kuhar wrote:

You can wrap it in the `detail` namespace

https://github.com/llvm/llvm-project/pull/188718